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Invest Ophthalmol Vis Sci. 1997 May;38(6):1130-8.

Murine orthotopic corneal transplantation in high-risk eyes. Rejection is dictated primarily by weak rather than strong alloantigens.

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  • 1Schepens Eye Research Institute, Boston, MA 02114, USA.

Abstract

PURPOSE:

Using a model of orthotopic corneal transplantation in which allografts were placed in normal eyes of mice, the authors previously reported that grafts bearing minor H antigens alone are more likely to be rejected (approximately 50%) than are grafts displaying only major histocompatibility (MHC) alloantigens (20%). These studies have been extended to include corneal grafts placed in neovascularized high-risk eyes of recipient mice.

METHODS:

Neovascularization was induced by placing sutures in the central cornea of one eye of recipient mice. Two weeks later, MHC class I only, class II only, minor H only, or MHC+minor H disparate corneas were grafted into these sutured eyes, and their rejection rates were examined.

RESULTS:

Although MHC+minor H disparate corneal allografts were rejected uniformly in neovascularized graft beds in 12 (100%) of 12, MHC class I only disparate grafts were rejected in 8 (66.7%) of 12 and MHC class II only disparate corneal allografts were rejected in 7 (58.3%) of 12. Surprisingly, the rejection rate of minor H only disparate corneal allografts was 10 (90.9%) of 11.

CONCLUSIONS:

These findings indicate that for orthotopic corneal allografts placed in high-risk graft beds, minor H antigens offer a more formidable barrier to graft acceptance than do MHC-encoded antigens. The authors speculate that this unexpected outcome may reflect a reduced level of MHC expression on corneal tissue. Moreover, because the cornea as a graft lacks bone marrow-derived dendritic cells, allorecognition by recipient T cells must occur by way of the indirect pathway of alloantigen processing, and in this situation, minor H antigens may compete favorably with MHC antigens for presentation by recipient antigen-presenting cells that infiltrate the graft.

PMID:
9152232
[PubMed - indexed for MEDLINE]
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